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G. A. Kontadakis ; G. A. Kounis ; G. D. Kymionis ; A. Stratos ; I. G. Pallikaris

Comparative Evaluation of Photorefractive Keratectomy With Use of Excimer Laser and Solid-State Laser System. G. A. Kontadakis ; G. A. Kounis ; G. D. Kymionis ; A. Stratos ; I. G. Pallikaris Institute of Vision and Optics, University of Crete, Heraklion Crete, Greece.

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G. A. Kontadakis ; G. A. Kounis ; G. D. Kymionis ; A. Stratos ; I. G. Pallikaris

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  1. Comparative Evaluation of Photorefractive Keratectomy With Use of Excimer Laser andSolid-State Laser System G. A. Kontadakis; G. A. Kounis; G. D. Kymionis; A. Stratos; I. G. Pallikaris Institute of Vision and Optics, University of Crete, Heraklion Crete, Greece. The authors have no financial interest in the subject matter of this poster.

  2. introduction • Solid state laser technology was introduced in refractive surgery as an alternative to the excimer laser. The gain medium in these devices is Nd:YAG crystals that generate beam of 1064nm. The radiation that is produced by transmitting the 1064nm beam throw a setting of non linear crystals has a wavelength of 213nm. It has been proved to be suitable for corneal ablation and also to have similar ablation profile with the 193nm pulsed radiation. The main benefit of the 213 nm wavelength beam is that it less absorbed by salt solutions and therefore the ablation rate is probably less dependent on corneal hydration during surgery. Purpose: • To compare refractive results of photorefractive keratectomy (PRK) with the Solid State laser and Excimer laser.

  3. Methods • This retrospective cohort study comprised 82 patients (147 eyes) who received PRK with the excimer laser Allegretto 400 Wave Eye-Q (group 1), and 73 (145 eyes) who received PRK with the solid state laser Pulzar Z1 (group 2). • All patients had a complete ophthalmic examination preoperatively to exclude ocular disease. All procedures were performed by the same surgeon (I.G.P.) using an identical technique. • Preoperative and postoperative assessments included: uncorrected distance visual acuity (UDVA), corrected distance VA (CDVA), manifest and cycloplegicrefractions, slit lamp examination and corneal topography. • Normality of distribution of continuous variables were assessed with the Kolmogorov-Smirnov test. Variables with normal distribution were compared with independent samples t-test. When distribution was not normal Mann-Whitney test was used to asses the differences.

  4. Methods(2) • Patient demographics: SEQ: sherical equivalent; mean mmc time is the mean time of intraoperativeMitomycin C application. All parameters did not show statistically significant differences between the groups.

  5. Results: Rem SEQ: (attempted correction)-(achieved correction) in spherical equivalent Differences between parameters in corresponding laser groups were not statistically significant

  6. Solid state laser Results:safety Excimer laser Both laser platforms performed similarly in terms of safety of the procedure

  7. Results:predictability Solid state laser Procedures performed with both laser platforms performed demonstrated satisfying predictability Excimer laser

  8. Results:stability Refractive results showed similar stability after procedures performed with both laser platforms

  9. Conclusions: Both systems performed similarly in terms of safety, efficacy and predictability. The use of the Solid State laser for the correction of myopia with photorefractive keratectomy is an effective alternative for the Excimer laser.

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